Daily Quizzes: Many Rewards Await (December 22–December 24)

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1. When the unit is operating normally, the formation of vacuum in the condenser depends on ( ). (A) Condensation of exhaust steam (B) Operation of the extraction pump (C) Normal condition of the steam seal. 2. When the unit loses load, the thermal stress generated on the rotor surface is （ ） stress. (A) Tensile stress. (B) Compressive stress. (C) No stress is generated. 3. For a given turbine, the magnitude of the thermal stress in its rotor or cylinder mainly depends on ( ). (A) Temperature distribution within the rotor or cylinder (B) Steam pressure. (C) Unit load AAA: Please hide your replies; editing after posting is invalid! Those with different views on the provided answer keys can post discussions the next day. For responses from multiple accounts under the same IP, only the first response is considered valid. All three questions are multiple-choice questions; 3 points are awarded for each correct answer, and 10 points – worth either Wealth or Charm – are given for answering all three correctly. There is a reward for everyone who participates. Please hide your answers; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Those who provide in-depth explanations and discussions in addition to giving correct answers may receive additional rewards (no extra points will be given if answers are not hidden)